O.V.U.M. is the final boss of Gradius Gaiden. It takes the form of multiple bosses from Salamander.

Attack Pattern

3 Intruders circle in from offscreen to form a Zelos Force. After a certain time or amount of hits, it shifts forms again into a Brain Golem before disintergrating.

Grgaiden ovum



The Face of O.V.U.M.

The red image shown at the beginning of the fight, ripped from the sprite sheet of O.V.U.M that was ripped from the game.

  • The acronym O.V.U.M is the spelling of the word Ovum which means egg.
  • It has never been known who exactly O.V.U.M. was and maybe we will never know.
  • Shortly before the battle begins, you can see a red face which looks more like an Intruder's face. Could this be O.V.U.M's physical form before shapeshifting or did Konami just put that there with no meaning whatsoever?
  • O.V.U.M.'s name stands for "Original Visions of the Ultimate Monsters", which may mean it is the power of ultimate evil condensed into physical form.
  • It may also be the fusion of cells from Intruder, Zelos Force, and Brain Golem that ended up in the Dark Nebula and grew into one combined cell.
Gradius Gaiden
Ships Vic ViperLord BritishJade KnightFalchion β
Stages Beyond the White StormRequiem for RevengersInto the Crystal CageRuins of SilenceOrganic FortressGreen InfernoOn the Event HorizonFormidable GuardiansFate...
Bosses Blizzard CrawlerGraveNobilShining CoreMoai DimensionMad SkinStinger KidHunter FangGiga's RoseKrakenLaser TetranDeathDoubleParasite CoreTriple CoreDeltatryJuggler CoreNeo Big CoreHeaven's GateBoost CoreGunner WallHeavy DuckerSolO.V.U.M.
End Bosses & Major Enemies
Major Recurring Foes GoferBacterionDr VenomZelos Force (Zeros)Lars EmpireGofer Sisters
Minor Enemies BrainO.V.U.M.Eleos BrainMother Computer Z Guardian CoreCentral Server Genocide CoreOuter Limits / Metal SlaveZelos BarrierDoomDark Force